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Roots Organics HP2 liquid seabird guano is a specially extracted natural source of organic phosphorus. Guano is renowned as a source of available natural phosphorus for use during flowering and fruiting. Aurora Innovations has taken generations of gardening experience and distilled it into a unique, easy-to-use formula for the hobbyist and professional gardener. Roots Organics HP2 is minimally processed to preserve all of the benefits and amazing synergistic qualities found in guano and biogenic phosphate rock.